Those are late hatch - not 5 mths old. + one on what Snipe said. I have seen BG that size in Jan. 2 inch BG stocked into a new southern pond in May will spawn before the summer is over - often some in Oct.
I’m not understanding “ not 5 mths old.
If they were late hatch. Late September- Early October. This was February 27th.
That’s 5 months. Doesn’t aging start at the time they are hatched?